SPARK-3779. yarn spark.yarn.applicationMaster.waitTries config should be...

... changed to a time period

Author: Sandy Ryza <sandy@cloudera.com>

Closes #3471 from sryza/sandy-spark-3779 and squashes the following commits:

20b9887 [Sandy Ryza] Deprecate old property
42b5df7 [Sandy Ryza] Review feedback
9a959a1 [Sandy Ryza] SPARK-3779. yarn spark.yarn.applicationMaster.waitTries config should be changed to a time period